Nagarjuna, also known as Nagarjuna Bodhisattva, was a major figure in Buddhism who lived in India around 150-250 CE. He is considered to be one of the most important and influential Buddhist philosophers of all time. Nagarjuna is best known for his teaching on the "Middle Way," which is a philosophy that emphasizes the middle ground between two extremes. This philosophy is based on the idea that ultimate reality, or Nirvana, cannot be grasped through either extreme views such as eternalism (the belief that the self or the universe is eternal) or nihilism (the belief that nothing exists). Instead, Nagarjuna taught that the ultimate reality is to be found in a middle ground, where all things are seen as being dependent on one another and ultimately empty of inherent existence. Nagarjuna is also known for his teaching on the "Two Truths," which is the distinction between conventional truth (the truth of our everyday experience) and ultimate truth (the truth of ultimate reality). According to Nagarjuna, conventional truth is the truth of our everyday experience, while ultimate truth is the truth of the ultimate reality that lies beyond our everyday experience. In addition to his teaching on the Middle Way and the Two Truths, Nagarjuna is also known for his work on the "emptiness" (shunyata) of all things. According to Nagarjuna, all things are empty of inherent existence and are dependent on one another. This emptiness is not to be understood as nothingness, but rather as the interdependence and impermanence of all things. Nagarjuna's teachings had a profound influence on the development of Buddhism, particularly in the Mahayana tradition. His works were widely studied and were influential in the development of many Buddhist schools, including the Madhyamaka, the Yogacara, and the Tathagatagarbha.